Properties of Mixtures

Some properties are

• They are formed by mixing of 2 or more substances. ( These may be elements or compounds)
  For example : Lemonade is made by mixing lemon juice, water and sugar.

• The substances are not chemically combined in a mixture
  For example: Let us consider the water and sugar in the lemonade. The molecules are merely present in the solution without forming bonds. 

• A mixture has variable composition (Ratio of 2 or more substances may not be the same)
  For example: The amount of lemon extract, sugar, water can vary while making the lemonade. Though the ratio of ingredients varies, the mixture remains lemonade.
  
  
• A mixture shows properties of substances it is made up of ( constituent substances)
  For example : Sugar which is a sweet substance, and on being added to lemon juice.. it makes the mixture sweet

• Different Elements of Mixtures can be separated by Physical methods (like Filtration, Sublimation, Evaporation etc.)
  For Example : We can separate sugar from lemon water using Distillation
  

Example 1

• If we put salt in water , it is a mixture
• It does not form a new substance chemically.
• It is possible to separate salt from water by using physical methods like evaporation.

Example 2

• Air is a mixture of different gases like Oxygen, Carbon Dioxide, Nitrogen etc.
• It is possible to separate these different gases by using physical methods